My take on his last statemenets? There´s a point when things get so obvious that you have to end up accepting the facts. Vettel´s performance is as much of a factor in the current success he enjoys as his cars. Vettel has always had doubters, and by now, after all this time performing at top level, all of them have been proved wrong, including Alonso. No one dares saying "he´s not as good as Alonso/Hamilton/Räikkönen" with a straight face anymore. And he´s had to work double to get the same credit that them.
Everyone's had to work double to just keep up with the Vet/RB train. Vettel's driving has been a factor in his success, of course, but when you have the best car, which he does, it's easy to discredit the driver. I was one of those in 2010 and 2011, but he was pretty spectacular in 2012 and has been so in 2013 as well. I don't doubt his driving ability for one second, but that doesn't mean I don't think he's had it easier than the others, still.
He IS as good as ALO/HAM/RAI as it stands, IMO, but when you have a team like RB backing you, developing your car to the top, giving you the fastest pit stops, and making the best decisions on the pit wall, it's easier to drive at that level and, more importantly, maintaining it.
Alonso's always been fighting the whole RB package, what he says to the press notwithstanding.